{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical", "Disease"], "input": "Infusion of the central nervous system alpha2 - adrenergic receptor agonist clonidine also resulted in a greater reduction in MAP in both groups of SHR that were fed the high ( compared with the basal ) sodium chloride diet ."}
{"Chemical": ["alpha2 - adrenergic receptor agonist", "clonidine", "sodium chloride"], "Disease": []}